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The injury bug has been nipping at the USC Trojans all spring, as wide receivers and tight ends have missed time with nagging injuries.

But during Thursday's practice it took a big bite out of the Trojans' running back depth, as tailback Tre Madden tore a ligament in his knee and will be out for the 2012 season, according to a school news release.

It happened on a run in which Madden was untouched and but went to the ground after attempting to make a cut in the open field.